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Note 7 - Accumulated Other Comprehensive Loss - Reclassification Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Settlement loss $ (4,600) $ 0 $ (2,900)
Total before income tax (31,246) (45,166) (50,316)
Income tax 6,058 9,351 10,337
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]      
Recognized actuarial loss [1] 2,466 1,753 1,164
Settlement loss [2] 4,583 0 2,852
Total before income tax 7,049 1,753 4,016
Income tax (1,368) (363) (823)
Net of income tax $ 5,681 $ 1,390 $ 3,193
[1] The recognized actuarial loss is included in the computation of net periodic benefit cost. See Note 9 to the Consolidated Financial Statements, Pensions and Other Postretirement Benefits
[2] The settlement loss is included in Other (expense) income, net in the Consolidated Statements of Income